Java postTweet方法返回空值
这是我的代码:Java postTweet方法返回空值,java,android,json,Java,Android,Json,这是我的代码: PostTweetDialog.java import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.app.DialogFragment; import android.content.Context; import android.content.DialogInterface; import android.os.Bundle
PostTweetDialog.java
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.codepath.apps.mysimpletweet.models.Tweet;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.JsonHttpResponseHandler;
import org.apache.http.Header;
import org.json.JSONObject;
import java.util.ArrayList;
/**
* Created by AlecksJohanssen on 4/1/2016.
*/
public class PostTweetDialog extends DialogFragment {
private RestClient client;
private PostTweetInterface dialogFragment;
ArrayList<Tweet> tweets;
TweetArrayAdapter adapter;
public Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = getActivity().getLayoutInflater();
View dialogView = inflater.inflate(R.layout.post_tweet, null);
EditText etComposeTweet = (EditText) dialogView.findViewById(R.id.posttxt);
final String body = String.valueOf(etComposeTweet.getText());
tweets = new ArrayList<>();
adapter = new TweetArrayAdapter(tweets);
AlertDialog.Builder TweetDialog = new AlertDialog.Builder(getActivity());
TweetDialog.setTitle("Post Tweet");
TweetDialog.setView(dialogView)
.setPositiveButton("Continue", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
client.postTweet(body, new JsonHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers, JSONObject json) {
Tweet myNewTweet = Tweet.fromJSON(json);
Log.d("DEBUG",String.valueOf(json.toString()));
tweets.add(myNewTweet);
adapter.notifyDataSetChanged();
}
@Override
public void onFailure(int statusCode, Header[] headers, Throwable throwable, JSONObject errorResponse) {
Log.d("Error", errorResponse.toString());
}
});
}
}).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
dialogFragment.onDialogNegativeClick(PostTweetDialog.this);
}
});
return TweetDialog.create();
}
post_tweet.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="@+id/posttxt"
android:inputType="text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:layout_marginLeft="4dp"
android:layout_marginRight="4dp"
android:layout_marginBottom="4dp"
android:hint="Input your Tweet here" />
</LinearLayout>
TimelineActivity.java
public class TimelineActivity extends AppCompatActivity {
private PostTweetDialog PostDialog = new PostTweetDialog();
private RestClient client;
private ArrayList<Tweet> Tweet;
private TweetArrayAdapter taAdapter;
private RecyclerView rvItems;
private TabLayout tabLayout;
private ViewPager viewPager;
private int[] tabIcons = {
R.drawable.ic_tab_favourite,
R.drawable.ic_tab_call,
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_timeline);
rvItems = (RecyclerView) findViewById(R.id.rvItems);
Tweet = new ArrayList<>();
taAdapter = new TweetArrayAdapter(Tweet);
rvItems.setAdapter(taAdapter);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
setupTabIcons();
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
rvItems.setLayoutManager(new LinearLayoutManager(this));
client = RestApplication.getRestClient();
populateTimeline(1);
rvItems.addOnScrollListener(new EndlessRecyclerViewScrollListener(linearLayoutManager) {
@Override
public void onLoadMore(int page, int totalItemsCount) {
populateTimeline(page);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
public void doThis(MenuItem item)
{
PostDialog.show(getFragmentManager(), "fragment_dialog");
}
private void populateTimeline(int page) {
client.getHomeTimeline(new JsonHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers, JSONArray response) {
Tweet.addAll(com.codepath.apps.mysimpletweet.models.Tweet.fromJSONArray(response));
int curSize = taAdapter.getItemCount();
taAdapter.notifyItemRangeInserted(curSize, Tweet.size() - 1);
}
@Override
public void onFailure(int statusCode, Header[] headers, Throwable throwable, JSONArray errorResponse) {
}
}, page);
}
private void setupTabIcons() {
tabLayout.getTabAt(0).setIcon(tabIcons[0]);
tabLayout.getTabAt(1).setIcon(tabIcons[1]);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new OneFragment(), "ONE");
adapter.addFrag(new TwoFragment(), "TWO");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
@Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
@Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
@Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
公共类TimelineActivity扩展了AppCompative活动{
private PostTweetDialog PostDialog=新建PostTweetDialog();
私人客户;
私人ArrayList推特;
专用TweetArrayAdapter适配器;
私人回收物品;
私人摊位摊位;
私人视页机视页机;
私有int[]选项卡图标={
R.drawable.ic\u tab\u最爱,
R.drawable.ic\u tab\u呼叫,
};
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_时间线);
rvItems=(RecyclerView)findViewById(R.id.rvItems);
Tweet=newarraylist();
taAdapter=新的TweetArrayAdapter(Tweet);
rvItems.setAdapter(taAdapter);
Toolbar Toolbar=(Toolbar)findViewById(R.id.Toolbar);
设置支持操作栏(工具栏);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager=(viewPager)findViewById(R.id.viewPager);
设置viewPager(viewPager);
tabLayout=(tabLayout)findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
setupTabIcons();
LinearLayoutManager LinearLayoutManager=新的LinearLayoutManager(此);
rvItems.setLayoutManager(新的LinearLayoutManager(本));
client=RestApplication.getRestClient();
人口时间线(1);
rvItems.addOnScrollListener(新的EndlessRecyclerViewScrollListener(linearLayoutManager){
@凌驾
public void onLoadMore(整版页面,整版项目目录){
populateTimeline(第页);
}
});
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(右菜单菜单菜单主菜单);
返回true;
}
公共作废点此(菜单项)
{
show(getFragmentManager(),“fragment_dialog”);
}
私有void populateTimeline(int页){
client.getHomeTimeline(新的JsonHttpResponseHandler(){
@凌驾
成功时的公共void(int statusCode,Header[]headers,JSONArray响应){
addAll(com.codepath.apps.mysimpletweet.models.Tweet.fromJSONArray(响应));
int curSize=taAdapter.getItemCount();
taAdapter.notifyItemRangeInserted(curSize,Tweet.size()-1);
}
@凌驾
public void onFailure(int statusCode,Header[]headers,Throwable Throwable,JSONArray errorResponse){
}
},第页);
}
私有void setupTabIcons(){
tabLayout.getTabAt(0).setIcon(tabIcons[0]);
tabLayout.getTabAt(1).setIcon(tabIcons[1]);
}
专用无效设置ViewPager(ViewPager ViewPager){
ViewPagerAdapter适配器=新的ViewPagerAdapter(getSupportFragmentManager());
addFrag(新的OneFragment(),“一”);
addFrag(新的TwoFragment(),“TWO”);
viewPager.setAdapter(适配器);
}
类ViewPagerAdapter扩展了FragmentPagerAdapter{
私有最终列表MFFragmentList=new ArrayList();
私有最终列表MFFragmentTitleList=new ArrayList();
公共视图页面编辑器(碎片管理器){
高级经理;
}
@凌驾
公共片段getItem(int位置){
返回MFFragmentList.get(位置);
}
@凌驾
public int getCount(){
返回MFFragmentList.size();
}
public void addFrag(片段、字符串标题){
添加(片段);
MFFragmentTitleList.add(标题);
}
@凌驾
公共字符序列getPageTitle(int位置){
返回MFFragmentTitleList.get(位置);
}
}
}
}
我不知道为什么我不能使用我的postTweet方法,它总是返回空值。
这是一个错误的gif
提前谢谢:D。
P/S:这一行的
client.postweet(body,new JsonHttpResponseHandler(){
如注释中所述,您没有在对话类中初始化客户端。您可以更改活动代码以将客户端作为参数传递:
public class TimelineActivity extends AppCompatActivity {
private PostTweetDialog PostDialog;
private RestClient client;
private ArrayList<Tweet> Tweet;
private TweetArrayAdapter taAdapter;
private RecyclerView rvItems;
private TabLayout tabLayout;
private ViewPager viewPager;
private int[] tabIcons = {
R.drawable.ic_tab_favourite,
R.drawable.ic_tab_call,
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_timeline);
rvItems = (RecyclerView) findViewById(R.id.rvItems);
Tweet = new ArrayList<>();
taAdapter = new TweetArrayAdapter(Tweet);
rvItems.setAdapter(taAdapter);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
setupTabIcons();
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
rvItems.setLayoutManager(new LinearLayoutManager(this));
client = RestApplication.getRestClient();
PostDialog = new PostTweetDialog(client);
...
}
...
}
然后在onCreate
中设置一个onClick
回调,该回调使用该客户端
TweetDialog.setView(dialogView)
.setPositiveButton("Continue", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
client.postTweet(body, new JsonHttpResponseHandler() { ... });
但是,在类PostTweetDialog
中,我找不到对该变量的赋值。因此,在PostTweetDialog
中,客户端
始终是未定义的
由于您可能希望使用与活动相同的RestClient
,因此有几个选项
client
引用传递给对话框类OnClickListener
,并在活动中实现onClick
,该活动已经有客户端
。但是,您需要将活动的引用传递给对话类如注释中所述,您没有在对话类中初始化客户端。您可以更改活动代码以将客户端作为参数传递:
public class TimelineActivity extends AppCompatActivity {
private PostTweetDialog PostDialog;
private RestClient client;
private ArrayList<Tweet> Tweet;
private TweetArrayAdapter taAdapter;
private RecyclerView rvItems;
private TabLayout tabLayout;
private ViewPager viewPager;
private int[] tabIcons = {
R.drawable.ic_tab_favourite,
R.drawable.ic_tab_call,
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_timeline);
rvItems = (RecyclerView) findViewById(R.id.rvItems);
Tweet = new ArrayList<>();
taAdapter = new TweetArrayAdapter(Tweet);
rvItems.setAdapter(taAdapter);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
setupTabIcons();
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
rvItems.setLayoutManager(new LinearLayoutManager(this));
client = RestApplication.getRestClient();
PostDialog = new PostTweetDialog(client);
...
}
...
}
然后在onCreate
中设置一个onClick
回调,该回调使用该客户端
TweetDialog.setView(dialogView)
.setPositiveButton("Continue", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
client.postTweet(body, new JsonHttpResponseHandler() { ... });
但是,在类PostTweetDialog
中,我找不到对该变量的赋值。因此,在PostTweetDialog
中,客户端
始终是未定义的
由于您可能希望使用与活动相同的RestClient
,因此有几个选项
client
引用
TweetDialog.setView(dialogView)
.setPositiveButton("Continue", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
client.postTweet(body, new JsonHttpResponseHandler() { ... });